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Step.  Display the values from the text file on the compiler screen.

Readmemb click here. Its  used for reading binary numbers instead of hex.

// Verilog code example for file operations

// module declaration

module file_readmemh; 

/* Declare a array 4 word deep 20 locations wide for 20/4 = 5 hexadecimal words */ 

reg [19:0] data [0:3];

// initalize the hexadecimal reads from the vectors.txt file

initial $readmemh("vectors.txt", data);

/* declare an integer for the conditional

statement to read values from test file */

integer i;

/* FOR loop to read and display the values from the text file on the compiler screen */ 

initial begin

        $display("rdata:");

        for (i=0; i < 4; i=i+1)

        $display("%d:%h",i,data[i]);

end     

endmodule 

Program. File operation using ‘readmemh’ for reading hex values from test files. 

Step. Verilog code example for file operations.

Step.  Declare a array of 4 word deep and 20 locations wide to store 5 hexadecimal values.

Step.  Use ‘readmemh’ command to read hexadecimal values.

Step.  Declare an integer to set a pointer to read values from test file.

Verilog readmemh (or readmemb) function in rtl

Following program is discussed in this section

Results

Input => File vectors.txt =>

12abc  34def  1dead 2bee1

Output =>

0:12abc

1:34def

2:1dead

3:2bee1